32 JOURNAL OF COMPARATIVE NEUROLOGY. 
and also showed the peculiar characters both of color and of 
size exhibited by these microsomes. He identified these cor- 
puscles as the centrosome: ‘‘Das central Kornchenhauflein, 
ist ohne Frage identisch mit den Centralkorperchen van BENE- 
DEN’s.”’ The protoplasmic area which shows a concentric ar- 
rangement was called by this same investigator the ‘‘plasmo- 
sphere.” He further distinguished within the plasmosphere, the 
definite area with a less quantity of the protoplasm and with 
somewhat transparent appearance, which he termed the ‘‘cen- 
trosphere.’”’ But he does not mention a radial arrangement of 
the protoplasm. 
Soon after von LENHOssEK’s discovery of the centrosome, 
many investigators reported their observations on the centro- 
some in many different classes of animals. The centrosome 
was found by DEHLER’ (’95) in the sympathetic ganglion cells 
of frog; by BUH Ler’ (’95, ’98) in the spinal ganglion cells of 
- the frog (’98) and in the nerve cells in the brain of the lizard 
(95); by Lewis? (’96, ’98) in the giant nerve cells of an annelid 
which belongs to the Malduiae; by McCrure* (’96) in the gan- 
glion cells of Helix pomatia; by ScHAFFER’ (’96) in the ganglion 
1 DEHLER, A.—Beitrige zur Kenntniss von feineren Bau der sympathischen 
Ganglienzellen des Frosches. Arch. fiir Mikr. Anat., Bd, xvi (95), P- 724-729. 
2 BUEHLER, A.—Protoplasma-structur in Vorderhirn Zellen der Eidechse. 
Wiirzburg, ’95. 
BUEHLER, A.—Untersuchungen iiber den Bau der Nervenzellen. Kémzgl. 
Hof.-und Univ. Verlag., ’98. 
5 Lewis, M.—Centrosome and sphere in certain of the nerve cells of an 
Invertebrate. Anat, Anz., Bd. xii (’96), S. 291-299. 
Lewis, M.—Studies on the central and peripheral nervous systems of two 
polychete annelids. Proceed. of the American Acad, of Arts and Sciences. Vol. 
XXxyili (’98), No. 14. 
* McC urE, C. F. W.—On the presence of centrosome and attraction 
spheres in the ganglion cells of Helix pomatia, with remarks upon the structure 
of the cell-body. Princeton College Bulletin, Vol. viii (’96), No. 2, p. 38-41. 
5 SCHAEFFER, I,—Ueber einen neuen Befund von Centrosomen in Ganglien 
und Knorpelzellen. Stt#d, d. Acad. d. wiss. Wien., Math-nat., Cl. ’96. 
